Whilst it's taken me considerably longer than 50(ish)days! to get to Master I've pretty much got the same equipment list.
One thing I have noticed is that my ghost putter, using the GI2-S balls is that my putting has become very sensitive to breaks and ball speed.
Sometimes it feels like I can't missing from 20ft, but if I slightly miss the ding it seems to start off in a totally different direction and I can't even put anything in the hole from 6ft if there's any kind of slope involved.
Everything else in my kit list seems to do me well, especially the 235yd 3wd I picked up, really helps on the longer par5's - it's just the damned putter.
I'm close to pulling the trigger on the sabretooth, and coming here for advice and finding this email makes me think the OP is also feeling that there is a bit more potential to be had if his current set up is tweaked (rather than replaced wholesale).
My best round was a 63 (just after I got promoted to Master ironically) but there were at least another 3-4 shots going begging in that round where the loss of feel caused the miss (rather than just being rubbish :) ).
I'm wondering if it might be the putter/ball combination doing it - does anyone have any advice on how the ball affects putting? I suppose I'm looking for a little more forgiveness from my putter.